The Lord Lonsdale Challenge Belt, commonly known as the Lonsdale Belt, is the oldest championship belt in British professional boxing. Hugh Lowther, 5th Earl of Lonsdale introduced the prize on behalf of the National Sporting Club (NSC), intending it to be awarded to British boxing champions. Arthur Frederick Bettinson, manager of the NSC, introduced terms and conditions regarding the holding of the belt, which ensured its lasting prestige.

Freddie Welsh won the first Lonsdale Belt in 1909 after winning the NSC British Lightweight title. Heavyweight Henry Cooper was the first and only boxer to win three Lonsdale Belts during his 17-year professional career. In 1929 the British Boxing Board of Control (BBBofC) assumed responsibility for awarding the belt, which continues to be awarded to British champions since then.

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